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Calculating percentages per course - Oracle Query

Posted on 2016-10-20
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Last Modified: 2016-10-20
I have 2 problems here.
#1
Courses aren't grouping together.  My results have the same course listed several times with different count(*) per row.  Each identical course_name and course_number should be grouped into 1

#2
I need to get the percentage of ethnicity not equal to 04 per course.  So the total students.ethnicity not equal to 04 divided by the total instances of  students.student_number "for each" individual course.   The percentage I'm calculating in the query below only returns 0% or 100% which isn't correct.

Thanks so much!!!

SELECT 
CC.COURSE_NUMBER,
COURSES.COURSE_NAME,
count(*) as COURSE_ENROLLMENT,
ROUND(COUNT(CASE WHEN STUDENTS.ETHNICITY != '04' THEN 1 end)/ count(*) * 100) || '%' Minority

FROM         
STUDENTS
LEFT JOIN CC ON CC.STUDENTID = STUDENTS.ID
LEFT JOIN S_CT_STU_DEMOGRAPHICS_X ON STUDENTS.DCID = S_CT_STU_DEMOGRAPHICS_X.STUDENTSDCID
LEFT JOIN COURSES ON CC.COURSE_NUMBER = COURSES.COURSE_NUMBER

WHERE     
CC.TERMID IN ('2600','2601','2602')
AND STUDENTS.SCHOOLID IN ('61', '62') 
AND STUDENTS.ENROLL_STATUS = 0
AND COURSES.GRADESCALEID in (110,123)

GROUP BY
CC.COURSE_NUMBER,
STUDENTS.ETHNICITY,
COURSES.COURSE_NAME

ORDER BY CC.COURSE_NUMBER

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Question by:Basssque
3 Comments
 
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Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
Comment Utility
>>My results have the same course listed several times

It is probably because you are grouping on ETHNICITY.  You will end up with one course_number and course_name row for each ETHNICITY value.



If you want a copy/paste solution, please provide sample data and expected results.
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LVL 31

Expert Comment

by:awking00
Comment Utility
Can you provide some sample data (dummy it up if it's proprietary) for that query and what you expect the percentages to be?
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Author Closing Comment

by:Basssque
Comment Utility
I just had to remove ethnicity from the group by clause and everything now works as expected.  Thanks so much!
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